Answer:
dyes used in negative staining have an. acidic chromagen (negatively charged chromophore) Examples of negative stains. NIgrosin and eosin. heat fixing smears can.
 
        
                    
             
        
        
        
Answer; 
The first choice (A) is an unsaturated fatty acid.
Explanation; 
-An unsaturated fat is a fat or fatty acid in which there is one or more double bond in the fatty acid chain.
-A fat molecule is monounsaturated if it contains one double bond, and polyunsaturated if it contains more than one double bond. In this case, the unsaturated fat (A) is polyunsaturated. 
 
        
                    
             
        
        
        
Answer:
true 
Explanation:
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Hello 
Humans conduct internal fertilisation. 
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<span>your answer is cranial cavity </span>